Rounding and converting raster values

[BeckB]

Hello,

I'm using ArcGIS Pro 2.8.1. I have a raster layer whose values I would like to round and then convert into a corresponding value. For example, if the current value is 9.788, I would round that to 10 and convert that to 144. Is there a way to do this?

[JayantaPoddar]

This is what I calculated. Please correct me if I am wrong.

Result of Con Function (Raster Value)	Con Function -1	Calculation of No. of Days	Julian Day
1	0	16 x 0	0
2	1	16 x 1	16
3	2	16 x 2	32
4	3	16 x 3	48
5	4	16 x 4	64
6	5	16 x 5	80
7	6	16 x 6	96
8	7	16 x 7	112
9	8	16 x 8	128
10	9	16 x 9	144
11	10	16 x 10	160
12	11	16 x 11	176
13	12	16 x 12	192
14	13	16 x 13	208
15	14	16 x 14	224
16	15	16 x 15	240
17	16	16 x 16	256
18	17	16 x 17	272
19	18	16 x 18	288
20	19	16 x 19	304
21	20	16 x 20	320
22	21	16 x 21	336
23	22	16 x 22	352

[BeckB]

This makes sense! However, in my case, the Julian day begins at 1, not 0. Here's a chart of the conversion; would this mean the subtraction is not necessary?

[JayantaPoddar]

Just add 1 at the end of the expression (outside all brackets). Updated my last expression.

[BeckB]

To clarify, do you mean like this?

16*((Con(("RASTER" - (RoundDown("RASTER"))== 0.5),RoundUp("RASTER"),RoundUp("RASTER" - 0.5)))-1)+1

[JayantaPoddar]

Yes.

[BeckB]

Okay, thank you so much!! I really appreciate your help.

[Luke_Pinner]

If your values are all positive, just add 0.5 before truncating.

Int("RASTER" + 0.5)

You can then reclassify the rounded values to whatever you want.